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Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
After-Tax Amount    
Accumulated derivative net losses as of beginning of period $ 2,837.2  
Net losses reclassified from accumulated other comprehensive loss into income 4.2 $ 2.4
Accumulated derivative net losses as of end of period 2,876.0  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Before-Tax Amount    
Accumulated derivative net losses as the beginning of the period (10.1)  
Net changes in fair value of derivatives 2.0  
Net losses reclassified from accumulated other comprehensive loss into income 1.3  
Accumulated derivative net losses as of the end of the period (6.8)  
Income Tax    
Accumulated derivative net losses as of the beginning of the period (1.4)  
Net changes in fair value of derivatives 0.0  
Net losses reclassified from accumulated other comprehensive loss into income 0.0  
Accumulated derivative net losses as of the end of the period (1.4)  
After-Tax Amount    
Accumulated derivative net losses as of beginning of period (8.7)  
Net changes in fair value of derivatives 2.0  
Net losses reclassified from accumulated other comprehensive loss into income 1.3  
Accumulated derivative net losses as of end of period $ (5.4)